CVE-2022-21994 in Windows
Summary
by MITRE • 02/09/2022
Windows DWM Core Library Elevation of Privilege Vulnerability.
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Analysis
by VulDB Data Team • 02/12/2022
The Windows Desktop Window Manager DWM Core Library Elevation of Privilege Vulnerability represents a critical security flaw within the Windows operating system's core graphical subsystem. This vulnerability resides in the Desktop Window Manager component responsible for rendering desktop elements and managing window composition. The flaw allows an attacker with low-privilege user access to escalate their privileges to SYSTEM level, effectively compromising the entire system. The vulnerability specifically affects the DWM Core Library which handles the rendering pipeline for desktop windows and visual effects, making it a fundamental component of the Windows graphical user interface architecture.
The technical implementation of this vulnerability stems from improper validation of user-supplied data within the DWM Core Library functions. When processing certain graphical operations or window management commands, the system fails to adequately validate input parameters that control memory access patterns and privilege levels. This improper validation creates a condition where malicious input can manipulate the execution flow and bypass security checks that normally prevent privilege escalation. The flaw manifests when the DWM service processes specially crafted graphical commands that cause memory corruption, allowing attackers to execute arbitrary code with elevated privileges. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios that can lead to privilege escalation.
The operational impact of this vulnerability is severe and far-reaching across enterprise environments. Attackers can exploit this weakness to gain SYSTEM-level access without requiring administrative credentials, making it particularly dangerous for organizations with standard user accounts. Once escalated, attackers can manipulate system files, install malware, establish persistence mechanisms, and access sensitive data across all user accounts. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, creating widespread exposure across enterprise networks. The attack surface is expanded due to the DWM service running continuously in the background, providing persistent access opportunities for threat actors. This vulnerability directly maps to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation', and T1547.001, which addresses 'Registry Run Keys / Startup Folder' for maintaining persistence after privilege escalation.
Mitigation strategies for CVE-2022-21994 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vendor has released patches addressing this specific vulnerability. Organizations should implement network segmentation to limit lateral movement opportunities and monitor for suspicious graphical process activities that may indicate exploitation attempts. Security teams should enable exploit protection features such as Application Control Policies and Enhanced Mitigation Experience Toolkit to prevent exploitation of memory corruption vulnerabilities. Additional defensive measures include restricting user privileges where possible, implementing strict access controls for system resources, and maintaining comprehensive logging of graphical subsystem activities. The vulnerability demonstrates the importance of securing core operating system components that handle user interface rendering, as these services often operate with elevated privileges and represent attractive targets for attackers seeking privilege escalation. Organizations should also consider implementing behavioral monitoring solutions that can detect anomalous patterns in window management operations that may indicate exploitation attempts.